Genesis of mass transport deposits and their effect on gas hydrate accumulation in the Qiongdongnan Basin
DU Hao1, SHI Wanzhong1, LIANG Jinqiang2,3, WANG Ren1, HE Yulin2,3, XU Litao1
1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China; 2. Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, Guangdong 510075, China; 3. Southern Marine Science and Engineering Guang-dong Labratory(Guangzhou), Guangzhou, Guangdong 511458, China
Abstract：The deep-water area of the Qiongdongnan Basin has considerable gas hydrate resources and has developed multi-stage mass transport deposits (MTDs). However, the influence mechanism of MTDs on hydrate accumulation remains to be fully elucidated. In view of this, this study comprehensively analyzes the various factors that affect hydrate accumulation with core, drilling, logging, seismic and regional geological data, taking into account the main characteristics of MTDs. Further, with the coupling relationship of MTDs having different backgrounds as the starting point, the genesis of MTDs and their effect on gas hydrate accumulation in the Qiongdongnan Basin are explored. The following results are obtained. ① The difference between MTDs and in-situ sediments is significant. MTDs are denser and have much lower porosity. The log curves have low interval transit time and high resistivity. Biological detritus, gravel particles, etc. can be observed in the MTDs section. The seismic profiles of the MTDs section show a chaotic reflection structure. ② Since 5. 5Ma, the rapid subsidence of the Qiongdongnan Basin has led to the proliferation of provenance and the increases in the accommodating space and the gradient of continental slope, which provide prerequisites for the formation of MTDs. The MTDs developed on the northern continental slope are mainly controlled by sea level change, provenance, and slope gradient and triggered by magmatic activity. Those developed on the flanks of the submarine volcano in the southern uplift are directly controlled by magmatic activity. There is an isochronous coupling relationship among magmatic activity, MTDs of the southern uplift, and MTDs of continental slopes. ③ The deep gas source migrates to the stable zone for gas hydrate along the diapir and its derived channels and is covered by shallow MTDs to form a gas hydrate reservoir under suitable temperature and pressure conditions.
杜浩, 石万忠, 梁金强, 王任, 何玉林, 徐立涛. 琼东南盆地块体搬运沉积体系成因及其对水合物成藏的影响[J]. 石油地球物理勘探, 2021, 56(4): 869-881.
DU Hao, SHI Wanzhong, LIANG Jinqiang, WANG Ren, HE Yulin, XU Litao. Genesis of mass transport deposits and their effect on gas hydrate accumulation in the Qiongdongnan Basin. Oil Geophysical Prospecting, 2021, 56(4): 869-881.
王大伟,吴时国,吕福亮,等.南海深水块体搬运沉积体系及其油气勘探意义[J].中国石油大学学报(自然科学版),2011,35(5):14-19.WANG Dawei,WU Shiguo,LYU Fuliang,et al.Mass transport deposits and its significance for oil & gas exploration in deep-water regions of South China Sea[J].Journal of China University of Petroleum(Edition of Natural Science),2011,35(5):14-19.
[2]
Li X B,Liu H Q,Pan S X,et al.Subaqueous sandy mass-transport deposits in lacustrine facies of the upper Triassic Yanchang formation,Ordos basin,Central China[J].Marine & Petroleum Geology,2018,doi:10.1016/j.marpetgeo.2018.06.019.
[3]
Scholz N A,Riedel M,Bahk J J,et al.Mass transport deposits and gas hydrate occurrences in the Ulleung Basin,East Sea-Part 1:Mapping sedimentation patterns using seismic coherency[J].Marine & Petroleum Geology,2012, 35(1):91-104.
[4]
Alsop G I,Weinberger R,Marco T,et al.Distingui-shing coeval patterns of contraction and collapse around flow lobes in mass transport deposits-ScienceDirect[J].Journal of Structural Geology,2020,doi:10.1016/j.jsg.2020.104013.
[5]
Canals M,Lastras G,Urgeles R,et al.Slope failure dynamics and impacts from seafloor and shallow sub-seafloor geophysical data:case studies from the COSTA project[J].Marine Geology,2004,213(1-4):9-72.
[6]
Shanmugam G.New Perspectives on Deep-Water Sandstones:Origin,Recognit,Initiation,and Reservoir Quality[M].Elsevier,Amsterdam,2012.
[7]
秦雁群,万仑坤,计智锋,等.深水块体搬运沉积体系研究进展[J].石油与天然气地质,2018,39(1):140-152.QIN Yanqun,WAN Lunkun,JI Zhifeng,et al.Progress of research on deep-water mass-transport deposits[J].Oil & Gas Geology,2018,39(1):140-152.
[8]
Dixon B T,Weimer P.Sequence stratigraphy and de-positional history of the Eastern Mississippi Fan(Plei-stocene), Northeastern deep Gulf of Mexico[J].AAPG Bulletin,1998,82(6):1207-1232.
[9]
Rothwell R G,Thomson J,Kaehler G.Low-sea-level emplacement of a very large Late Pleistocene ‘megaturbidite’ in the western Mediterranean Sea[J].Nature, 1998, 392(6674):377-380.
[10]
王志君.白云深水区块体搬运沉积体系与水合物分解的相关性研究[J].石油地球物理勘探,2011,46(增刊1):144-150.WANG Zhijun.Study of correlation ship between mass transport deposits and the dissociation of gas hydrate in Baiyun deepwater area[J].Oil Geophysical Prospecting, 2011,46(S1):144-150.
[11]
王大伟,吴时国,秦志亮,等.南海陆坡大型块体搬运体系的结构与识别特征[J].海洋地质与第四纪地质,2009,29(5):65-72.WANG Dawei,WU Shiguo,QIN Zhiliang,et al. Architecture and identification of large quaternary mass transport depositions in the slope of South China Sea[J].Marine Geology & Quaternary Geology,2009,29(5):65-72.
[12]
Riedel M,Bahk J J,Scholz N A,et al.Mass-transport deposits and gas hydrate occurrences in the Ulleung basin, east sea-part 2:gas hydrate content and fracture-induced anisotropy[J].Marine & Petroleum Geology,2012,35(1):75-90.
[13]
王秀娟,吴时国,董冬冬,等.琼东南盆地块体搬运体系对天然气水合物形成的控制作用[J].海洋地质与第四纪地质,2011,31(1):109-118.WANG Xiujuan,WU Shiguo,DONG Dongdong,et al. Control of mass transport deposits over the occurrence of gas hydrate in Qiongdongnan basin[J].Marine & Petroleum Geology,2011,31(1):109-118.
[14]
Beaubouef R T,Abreu V,van Wagoner J C.Basin 4 of the Brazos-Trinity slope system,Western Gulf of Mexico:The terminal portion of a Late Pleistocene lowstand systems tract[C].SEPM 23rd Research Conference,2013.
[15]
Newton C S,Shipp R C,Mosher D C,et al.Importance of mass transport complexes in the Quaternary development of the Nile Fan,Egypt[C].Proceedings of the Annual Offshore Technology Conference,2004, doi:10.4043/16742-MS.
[16]
Wang D,Wu S,Qin Z,et al.Seismic characteristics of the Huaguang mass transport deposits in the Qiongdongnan Basin, South China Sea:implications for regional tectonic activity[J].Marine Geology,2013,346(12):165-182.
[17]
陈多福,李绪宣,夏斌.南海琼东南盆地天然气水合物稳定域分布特征及资源预测[J].地球物理学报,2004, 47(3):483-489.CHEN Duofu,LI Xuxuan,XIA Bin.Distribution of gas hydrate stable zones and resource prediction in the Qiongdongnan Basin of the South China Sea[J].Chinese Journal of Geophysics,2004,47(3):483-489.
[18]
杨金秀,宋朋霖,王红亮,等.琼东南盆地天然气水合物成藏模式及主控因素分析[J/OL].石油与天然气地质,2019,1-17.YANG Jinxiu, SONG Penglin, WANG Hongliang, et al. Gas hydrate accumulation model and major controlling factors in Qiongdongnan Basin[J/OL].Oil & Gas Geology, 2019,1-17.
[19]
王振峰,李绪深,孙志鹏,等.琼东南盆地深水区油气成藏条件和勘探潜力[J].中国海上油气,2011,23(1):7-13,31.WANG Zhenfeng,LI Xushen,SUN Zhipeng,et al. Hydrocarbon accumulation conditions and exploration potential in the deep-water region,Qiongdongnan basin[J].China Offshore Oil and Gas, 2011,23(1):7-13,31.
[20]
苏奥,陈红汉,贺聪,等.琼东南盆地崖城区泄压带流体活动特征及成岩响应[J].石油学报,2016,37(10):1216-1230.SU Ao,CHEN Honghan,HE Cong,et al.The characteristic of fluid activities and diagenetic responses of the pressure discharging zone in Yacheng area,Qiongdongnan Basin, South China Sea[J].Acta Petrolei Sinica,2016,37(10):1216-1230.
[21]
魏魁生,崔旱云,叶淑芬,等.琼东南盆地高精度层序地层学研究[J].地球科学——中国地质大学学报,2001,26(1):59-66.WEI Kuisheng,CUI Hanyun,YE Shufen,et al.High-precision sequence stratigraphy in Qiongdongnan Basin[J].Earth Science:Journal of China University of Geosciences,2001,26(1):59-66.
[22]
金丽娜,于兴河,董亦思,等.琼东南盆地水合物探区第四系深水沉积体系演化及与BSR关系[J].天然气地球科学,2018,29(5):644-654.JIN Lina,YU Xinghe,DONG Yisi,et al.The evolution of Quaternary depositional system in gas hydrate exploration area in Qiongdongnan Basin and its relationship with BSR[J].Natural Gas Geoscience,2018,29(5):644-654.
[23]
雷超,任建业,裴健翔,等.琼东南盆地深水区构造格局和幕式演化过程[J].地球科学——中国地质大学学报,2011,36(1):151-162.LEI Chao, REN Jianye,PEI Jianxiang,et al.Tectonic framework and multiple episode tectonic evolution in deepwater area of Qiongdongnan Basin, Northern Continental margin of South China Sea[J].Earth Science:Journal of China University of Geosciences, 2011,36(1):151-162.
[24]
甘军,张迎朝,梁刚,等.琼东南盆地深水区烃源岩沉积模式及差异热演化[J].地球科学——中国地质大学学报,2019,44(8):2627-2635.GAN Jun,ZHANG Yingzhao,LIANG Gang,et al. Deposition pattern and differential thermal evolution of source rocks,deep water area of Qiongdongnan basin[J].Earth Science:Journal of China University of Geosciences,2019,44(8):2627-2635.
[25]
袁玉松,杨树春,胡圣标,等.琼东南盆地构造沉降史及其主控因素[J].地球物理学报,2008,51(2):376-383.YUAN Yusong,YANG Shuchun,HU Shengbiao,et al. Tectonic subsidence of Qiongdongnan Basin and its main control factors[J].Chinese Journal of Geophysics, 2008,51(2):376-383.
[26]
夏少红,范朝焰,孙金龙,等.南海北部晚新生代岩浆活动的发育特征与构造意义[J].海洋地质与第四纪地质,2017,37(6):25-33.XIA Shaohong,FAN Chaoyan,SUN Jinlong,et al. Characteristics of Late Cenozoic magmatic activities on the northern margin of South China Sea and their tectonic implications[J].Marine Geology & Quaternary Geology, 2017,37(6):25-33.
[27]
何玉林,匡增桂,徐梦婕.北康盆地第四纪块体搬运沉积地震反射特征及成因机制[J].地质科技情报,2018,37(4):258-268.HE Yulin,KUANG Zenggui,XU Mengjie.Seismic reflection characteristics and triggering mechanism of mass transport deposits of Quaternary in Beikang basin[J].Geological Science and Technology Information,2018,37(4):258-268.
[28]
Sun Q,Alves T M.Petrophysics of fine-grained mass-transport deposits:A critical review[J].Journal of Asian Earth Sciences,2020, doi:10.1016/j.jseaes.2020.104291.
[29]
Ricardo L, Desirée P, Juan-Tomás V,et al. A new scenario for the mass transport deposits west Canary volcanic province[J].Earth and Planetary Science Letters,2019, doi:10.1016/j.epsl.2018.12.020.
[30]
Tripsanas E,Piper D,Jenner K,et al.Submarine mass-transport facies:new perspectives on flow processes from cores on the eastern North American margin[J].Sedimentology,2008,55(1):97-136.
[31]
马宏霞,吕福亮,范国章,等.缅甸若开海域块体搬运沉积地震响应及典型地质特征[J].石油与天然气地质,2011,32(5):751-759.MA Hongxia,LYU Fuliang,FAN Guozhang,et al.Seismic responses and geological characteristics of mass-transport deposits in the Rakhine Basin,Offshore Myanmar[J].Oil & Gas Geology,2011,32(5):751-759.
[32]
Sun Q,Alves T M, Zhao M, et al.Post-rift magmatism on the northern South China Sea margin[J].Geolo-gical Society of America Bulletin, 2020,132(11-12):2382-2396.
[33]
Lei C, Alves T M, Ren J, et al.Depositional architecture and structural evolution of a region immediately inboard of the locus of continental breakup(Liwan Sub-basin,South China Sea)[J].Geological So-ciety of America Bulletin,2019,131(7-8):1059-1074.
[34]
张丙坤,李三忠,夏真,等.南海北部深水区新生代岩浆岩分布规律及其与海底地质灾害的相关性[J].海洋学报,2014,36(11):90-100.ZHANG Bingkun,LI Sanzhong,XIA Zhen,et al. Distribution of Cenozoic igneous rocks and its relation to submarine geological hazards in the deepwater area of the northern South China Sea[J].Acta Oceanologica Sinica, 2014,36(11):90-100.
[35]
Liang J Q,Zhang W,Lu J A,et al. Geological occurrence and accumulation mechanism of natural gas hydrates in the eastern Qiongdongnan Basin of the South China Sea:Insights from site GMGS5-W9-2018[J].Marine Geology, 2019,doi:10.1016/j.margeo.2019.106042.
[36]
吴时国,秦志亮,王大伟,等.南海北部陆坡块体搬运沉积体系的地震响应与成因机制[J].地球物理学报,2011,54(12):3184-3195.WU Shiguo,QIN Zhiliang,WANG Dawei,et al.Seismic characteristics and triggering mechanism analysis of mass transport deposits in the northern continental slope of the South China Sea[J].Chinese Journal of Geophysics, 2011,54(12):3184-3195.
[37]
Cheng C,Jiang T,Kuang Z G,et al.Seismic characte-ristics and distributions of Quaternary mass transport deposits in the Qiongdongnan Basin,northern South China Sea[J].Marine and Petroleum Geology,2021, doi:10.1016/j.marpetgeo.2021.105118.
